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@@ -18,6 +18,7 @@
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* Theoretical lower bound on execution time::
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* Insert Task Utility::
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* The multiformat interface::
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+* On-GPU rendering::
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* More examples:: More examples shipped with StarPU
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* Debugging:: When things go wrong.
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@end menu
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@@ -640,6 +641,37 @@ extern "C" void multiformat_scal_cuda_func(void *buffers[], void *_args)
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A full example may be found in @code{examples/basic_examples/multiformat.c}.
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+@node On-GPU rendering
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+@section On-GPU rendering
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+
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+Graphical-oriented applications need to draw the result of their computations,
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+typically on the very GPU where these happened. Technologies such as OpenGL/CUDA
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+interoperability permit to let CUDA directly work on the OpenGL buffers, making
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+them thus immediately ready for drawing, by mapping OpenGL buffer, textures or
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+renderbuffer objects into CUDA. To achieve this with StarPU, it simply needs to
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+be given the CUDA pointer at registration, for instance:
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+
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+@cartouche
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+@example
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+ for (workerid = 0; workerid < starpu_worker_get_count(); workerid++)
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+ if (starpu_worker_get_type(workerid) == STARPU_CUDA_WORKER)
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+ break;
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+
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+ cudaSetDevice(starpu_worker_get_devid(workerid));
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+ cudaGraphicsResourceGetMappedPointer((void**)&output,
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+ &num_bytes, resource);
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+ starpu_vector_data_register(&handle, starpu_worker_get_memory_node(workerid), output, num_bytes / sizeof(float4), sizeof(float4));
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+
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+ starpu_insert_task(&cl, STARPU_RW, handle, 0);
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+
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+ starpu_data_unregister(handle);
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+
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+ cudaGraphicsUnmapResources(1, &resource, 0);
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+
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+ /* Now display it */
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+@end example
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+@end cartouche
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+
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@node More examples
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@section More examples
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